Is it permissible to name my daughter Nilya? And thank you.

This name is foreign (non-Arabic), and it is said to be derived from the Nile River. There is no objection to naming with it if it does not contain a bad meaning, as the basic principle regarding names is permissibility unless they contravene Islamic law. However, it is preferable not to name with it because it is foreign. It is not permissible to name with it if it is exclusive to non-Muslims.